The issue really is that she has shown some strange reservations around voting which implies a sort of phoned in read on her part. Like she just assumes that Sparkles is scum, and then instead of voting her, says she was going to vote you because Sparkles tends to vote her scum mates early. Just doesn't really strike me as a natural thought, and while that isn't anything new for Sky, usually this sort of discrepancy from her comes from a place of wanting to be town read or to benefit her survival... this doesn't actually further that at all, which gives me reason to suspect it comes from a separate agenda.